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Finding the Fourth Proportional to 1,278.75, 1,918.14 and 354.33

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Solution

The fourth proportional to 1,278.75, 1,918.14 and 354.33 is: 531.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,278.75 : 1,918.14 = 354.33 : x
  2. Step 2: Convert to fraction form
    1,278.75/1,918.14 = 354.33/x
  3. Step 3: Cross multiply
    1,278.75x = 1,918.14 × 354.33
  4. Step 4: Simplify right side
    1,278.75x = 679,654.55
  5. Step 5: Solve for x
    x = 679,654.55/1,278.75
  6. Step 6: Final answer
    x = 531.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.